Couple of options here. If you have enabled the admin port:
telnet localhost 5001
Once connected, you'll be able to do a lot, but the two key commands are:
state and status
The state or status should be able to tell you if you are connected or not. You can also do a "state on" and "status on" which will send you information back if things change.
Let's say your side of the tunnel has IP address 10.0.0.5, and the other side has 10.0.0.6. From your host, try pinging 10.0.0.6. If you get a response, you're connected and the appropriate routes (etc.) are in place. If not, something's wrong, and you should try the "state" and "status" commands.
Also, a traceroute should show both the 10.0.0.5 and 10.0.0.6.